| | BK1206AZ3
This Sky-Watcher 120mm (4") f/5 telescope is a two-element,
air-spaced, fullymulti-coated objective, achromatic refractor,
which can give exciting "richfield" astronomical views. It can
provide excellent vistas of star fields,clusters, nebulae,
galaxies, planets, the Moon and (with correct filtering or
byprojection) the Sun. It is also a fine terrestrial telescope when
mounted on analt-azimuth mount or a photographic tripod. Crisp
images at a reasonable pricemake it an excellent beginner's "first
telescope", or a great travellingtelescope for a more advanced
observer. Similar to the popular 80mm f/5 refractor, this larger
aperture model hasmore light collecting power at the same focal
ratio and accepts 2" diagonals forawesome wide field views, while
only a small amount to chromatic aberration andweight. Weighing
about 3kg. (6.5lbs.) the optical tube assembly is readilycarried
and with a compressed length of approximately 50cm (21.7") it is
easilytransported. Being a refractor, it is quick and easy to set up and the low-
maintenance,enclosed optics come fully collimated from the factory.
The optical tubeassembly comes with "tube-mounting rings".
Thesehinge open to allow easy installation of the optical tube and
the locks can beloosened during use to allow tube rotation and
balancing. Mounting the telescopeon an alt-azimuth or an equatorial
mount is quick and simple with theappropriate mounting plate. This telescope also performs well as a fixed aperture, 510mm lens
for bothterrestrial and astro photography. The "fast" f/5 focal
ratio, combined withtoday's high speed films, is excellent for
capturing lunar and solar eclipses as well as for nature
photographs. Asolid, equatorial mount and a method of guiding is
required for longer exposureastrophotography. A T-mount thread on
the eyepiece holder allows directattachment of an appropriate
T-adapter (readily available through camera shopsfor a specific
SLR) and the optional 60mm (2.5")extension tube gives closer
focussing for terrestrial photography.
|
